I can’t find his criticism of nostr…but it looks like he has an invite only beta running for an app that sort of encapsulates all types of public key user generated digital content…something that is, as best I can tell, akin notes and other stuff…and perhaps even transmitted by relays…

As far as all the nostr-like things out there, I think the real issue is one of resource utilization (storage, cpu, network bandwidth, etc) and it’s not something I have any understanding of…just seems like the fundamental problem of all networks.